Mark and Winnie shared some erasers equally. After Winnie bought 46 erasers and Mark gave 105 erasers away, they had 475 erasers left. How many erasers did each of them have at first?
| |
Mark |
Winnie |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 46 |
- 105 |
|
| After |
1 u + 46 |
1 u - 105 |
475 |
Mark and Winnie had the same number of erasers at first.
Total number of erasers in the end
= 1 u + 46 + 1 u - 105
= 1 u + 1 u + 46 - 105
= 2 u - 59
2 u - 59 = 475
2 u = 475 + 59
2 u = 534
1 u = 534 ÷ 2 = 267
Number of erasers that each of them had at first
= 1 u
= 267
Answer(s): 267
